Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6159#issuecomment-102183254
Here's some benchmark code which builds a map with millions of records that
have random 64-byte keys and values, then repeatedly iterates over the map and
copies the keys and values into byte arrays:
https://gist.github.com/JoshRosen/286b26494ab27e657051
For this benchmark, I saw a nearly 10x improvement as a result of this
patch.
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